Using a chime, a bell or a singing bowl are great ways to help people go inwards as part of mindfulness and guided meditation. In classes I often use sounds to help this transition to open the heart to love and healing.
Megan Cowan describes how she discovered how sound could help in education with school students. This is a great short story from a Bringing the Hearts and Minds Youth Conference where Megan integrates mindfulness using sound. This can be viewed on https://www.youtube.com/watch?v=qnatIJmdkH8